<template>
    <div class="wrapper">
        <v-head></v-head>
        <v-sidebar></v-sidebar>
        <div class="content-box" :class="{'content-collapse':collapse}">
            <div class="content">
                <el-row :gutter="24">
                    <el-col :span="24">
                        <v-tags></v-tags>
                    </el-col>
                </el-row>
                <el-row :gutter="24">
                    <el-col :span="24">
                        <transition name="move" mode="out-in">
                            <keep-alive :include="tagsList">
                                <router-view></router-view>
                            </keep-alive>
                        </transition>
                    </el-col>
                </el-row>
            </div>
        </div>
    </div>
</template>

<script>
    import vHead from './Header.vue';
    import vSidebar from './Sidebar.vue';
    import vTags from './Tags.vue';
    import bus from './bus';
    export default {
        components:{
            vHead, 
            vSidebar, 
            vTags
        },
        data(){
            return {
                tagsList: [],
                collapse: false
            }
        },
        created(){
            bus.$on('collapse', msg => {
                this.collapse = msg;
            })

            // 只有在标签页列表里的页面才使用keep-alive，即关闭标签之后就不保存到内存中了。
            bus.$on('tags', msg => {
                let arr = [];
                for(let i = 0, len = msg.length; i < len; i ++){
                    msg[i].name && arr.push(msg[i].name);
                }
                this.tagsList = arr;
            })
        }
    }
</script>

<style scope >
    .content-box {
        position: absolute;
        left: 200px;
        right: 0;
        top: 70px;
        bottom: 0;
        overflow-y: auto;
        -webkit-transition: left .3s ease-in-out;
        transition: left .3s ease-in-out;
        background: #f0f0f0;
    }

    .content {
        width: auto;
        margin: 25px;
        background: #fff;
        border-radius: 5px;
        padding: 15px;
    }

    .content-collapse {
        left: 65px;
    }
</style>